Spark plug for motor vehicle internal combustion engine

Details Spark plug for motor vehicle internal combustion engine Spark plug for motor vehicle internal combustion engine

2006-09-21

2011-10-18

Walford, Natalie (Department: 2879)

Electric lamp and discharge devices

Spark plugs

C313S136000, C313S137000, C313S144000, C313S145000

Reexamination Certificate

active

08040029

ABSTRACT:
A spark plug for a motor vehicle internal combustion engine, substantially elongated in shape, and including: two coaxial electrodes of an inner central electrode and an outer base electrode enclosing the central electrode; and an electrically insulating annular block, interposed between the central electrode and the base electrode and including an annular shoulder. The insulating annual block includes an annular groove located at the shoulder.

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